Core drill



July 7, 1931.

CORE DRILL Filed Nov. 15, 1927 f y1 www" J www, lm M5 1m www J n. fp/200W m j r lli) Patented July 7, 1931 UNITED STA-TES PATENT OFFICE Jnssnctwnf-IGHT, or"HUNtIfIlvGtLic 1ivn PARK, AND n'YNN I". BONNEY, oF Los ANGELES;

CALIFORNIA, AssIe-Nons 'ro WIEMAN. KAMMERER. wrvreifrr oo., INC.,i A CORPORA- 'IIoN 'or CALIFORNIA This invention has to do with a core drill, and it is an object of the invention to provide va drill for use in well drillingfor, the purpose of taking a core or sample of the formation being drilled.

It is a primary object of our present invention to provide a practical and improved arrangement and formation of cutting parts in a core drill.

Another object of the invention is to provide a .core drill which is simple and ineX- pensive and in which the wearing parts/can be readilyV renewed.

Another obj ect' of the invention is to pro,- vide a core drill having a detachable cut,- ter construction whereby the wearing'parts can be easily and quickly replaced.

Another object ofthe invention is to provide an -eiiective andjiinproved means'l for mounting the cuttingparts ofthe drill. j

The various objects and features of the invention willl be best and more fully understood from the following detailedtdescription of' typical forms and applications ofthe invention, throughout which description reference is had'to the accompanying drawings, in which: f

Fig'. 1 is a verticahdetailed, sectional view of thecore drill provided by our invention;

Fig. Q is a bottom or end view of the'drill, beingV a vi'ew taken as indicated by line 2-2 on Fig. l; f

Fig.3 is a transverse, sectional viewI of the drill, taken' as indicated `by line 3 3 on Fi'gll;

. Fig. 4 is an enlarged, detailed, sectional, View, taken as indicated by line 4i4 on Fis-3; Fig. 5 isa view similar to Fig.. 3, showing anotheryform of construction; j

Fig. 6 is yan enlarged, detailed,sectional view, taken` as indicated by line 6--6 on Fig.

Fig. 7 is an enlarged, detailed sectional View, similar to Fig. 4 showing another for of construction; and Y Fig. 8 is a .view taken as indicated by line 8?-8 on Fig. 7. j

The coredrill provided by our invention is suitable for-usein connection with a' string l of drill pipe 10 andthe usual form'of core barrel 11.` In` Fig. 1 of the drawings, we show the drill provided by ourl invention mounted on the lower end of arstring of .drill pipe l10 by means of a suitable collar or Vcoupling 12, ,and we show a core barrel 11 carried by the drill to project upwardly in the drill pipe 10. A core catcher 13 shown in connection with the drill `and core barrel.

Referring particularly to Figs. 1A to 4.of the drawings, the drillincludes a body 14 and a cutterl' detachably mounted onthe lower endl of the body. l

The body 14 istubular in formand .has

an upwardly andlinwardly ,projecting eX-.

tension 16 on its `upper end. The exterior of the extension is threaded to'receivethe cou* pling=12 applied to the lower end of the drill pipe-10. In accordance with` our invention,

the extension` 16 fits around the core barrel*y '11 with clearance, allowing-j circulatingfluid to, pass/from-the casing 10 into circulation 'openings-17 extending downwardly in thev body 14 from its upper end., The upper inner portion of the body 14 is provided with. a'recess 18l to receive'thecore catcher 13. The core barrel 11 screwsinto the recess 18 above thecore catcher. j Y

The cutter is applied to the lower-end of theshank 14'` and includes,v Generally, a curved body 2O fitting the lower erindofthe shank and a: plurality of teeth 21 and 22I projecting downwardly from; the body to make an annularcut in the formation, leavinga core to project upwardly past the core catcher 13 andthe barrel 11; The cutter and shank are which are secured together lby bolts 23. In

`the form .of the invention' under considera-V -tion,wthe body 2O of the cutter i's annular in formg the cutter orfcuttingmeans being in theform of a single integral unit. In this ca'se,the shank 14 has a single central ange 24.pr'oj'ecting downwardly fromA its lower end, :while flanges project upwardly from the4 body 2O Atoengage the innerand Youter sides of the flange 24. lVith this 4const-,ruction, thebody 20 andflanges 25 com letely surround the flange of the shank.. n acmore cuts or openings 26 are provided in the flange 24 of the shank and lugs 27 are formed between the flanges of the cutter to lit the openings 26, as clearly illustrated in Fig. 3 of the drawings. W'ith this arrangement, driving or rotating strain is imparted to the cutter through the cooperative engagement of the lugs and ends of the flange 24 formed by the openings 215. The flanges of the cutter and shank are connected by means of a plurality of bolts 23. The bolts serve mainly to hold the flanges 24 and 25 together and thus retain the cutter on the end of the shank. As above pointed out, the rotative strain is taken between the flange 24 and the lugs 27, thus relieving the bolts.

The teeth 21 project downwardly and outwardly from the body of the cutter to make the outer portion of the annular cut, while the -lteeth 22 project downwardly and somewhat inwardly from the body to make the inner portion Vof the annular cut. Each outer tooth 21 is provided at its lower end with a vcutting edge that extends inwardly and rearwardly with reference to a radial line, while each inner tooth 22 is provided at its lower end with a cutting edge 31 that extends outwardly and rearwardly with reference to a. radial line. By thus oppositely pitching the inner and outer teeth, they are made particularly effective in cutting their respective -portions of the bore. In accordance with our invention, there may be various numbers of teeth on the cutter. In the drawings, ywe have shown four outer teeth 21 and two inner teeth 22. The inner teeth 22 are located diametrically opposite each other, while the outer teeth areV suitably arranged between the inner teeth. A

Our present invention provides for the introduction of circulating fluid to the cutting teeth. The circulation openings A17, provided in the shank 14, extend downwardly from its upper end to its lower end whe-re they communicate with openings in the body 20. In the particular form of the invention shown in the drawings, there are circulation openings discharging immediately ahead of the inner teeth and also circulation openings discharging immediately ahead of certain of the outer teeth. It is to be understood that the circulation openings may be arranged to discharge in the most effective manner.

In Figs. 5 and 6 of the drawings, we disclose a ymodified form of construction wherein the cutter 15al is divided into separate Ysections A and B. In this case, each cutter section has a body part 20a carrying two outer GO' cutters 21 and one inner cutter 22. The body `part 20a has spaced upwardly projecting flange parts 25a which fit over flange parts 24a on the lower end of the shank. TheV flange partsk 24a and 25a are segmental in form, corresponding in extent to the cutter sections. In this form of the invention, lugs 27a or downward continuat-ions of the body may be provided Vbetween the segmental flange parts 24a to engage the ends of the segmental flange parts 25a. Bolts 23 may be provided for connecting the flange parts to retain the cutter sections in place on the shank. In this form of the invention, circulation openings may be provided to discharge through the shank and cutter sections, as

Ashown in Fig. 5, or they may be arranged to discharge directly from lthe shank through the lug portions 27a. In this form of the invention, the rotative driving strain is borne through the lugs 27a and the ends of the segmental flange parts 25a of the cutter sections. l i

In Figsjl' and 8 of the drawings, we disclose another form of connecting flange construction that may be used in place of that hereinabove described. In this case, there is a flange 245 projecting downwardly from the-lower end of the shank and a flange 255 projecting upwardly from the body of the cutter. The flanges 245 and 255 are preferably wide at their base and taper outwardly, and are preferably proportioned to fit together, as shown in Fig. 7. In this case, the flange 245 of the shank may be provided with one or more cuts or openings 265, and the cutter flange 255 may be provided with lugs 27 5 to fit the openings. Bolts 23 may be employed to'connect the flanges 245 and 255, as clearly shown in the drawings.

From the foregoing description, it will be apparent that our invention provides a construction in whichk the cutting or wearing parts are effectively secured'to the permanent shank at the same time being detachable so that they can be easily and quickly renewed or replaced, when desired. It is also to be noted limit ourselves to the specific details set forth,

but wish to reserve to ourselves any changes or variations that may appear to those skilled in the art or fall within the scope of the following claims:

Having described our invention, we claim:

1. A core drill including an annular shank having a flange projecting downwardly from its lower end, a cut-ter having downwardly projecting teeth and upwardly projecting flanges loverlapping the inner and outer sides of the flange on the shank, and cooperating lugs and openingsv at the flanges whereby the cutter is rotated by the shank.

2. A core drill including, a shankhaving a flange projecting downwardly from its lower end, a cutter having downwardly pro Ijecting teeth at its lower end, spaced upwardly projecting flanges on the upper end of the cutter overlapping the inner and outer sides of the flange of the shank, and bolts extending through the flanges of the cutter and shank.

8. A core drill including, a shank having a flange projecting downwardly from its lower end, a cutter having downwardly projecting teeth at its lower end, spaced upwardly projecting flanges on the upper end of the cutter overlapping the inner and outer sides of the flange of the shank, and a lug on the cutter extending between its flanges and cooperating with an opening in the flange of the shank whereby the cutter is rotated by the shank.

t. A core drill including, a shank having a flange projecting downwardly from its lower end, a cutter having downwardly projecting teeth at its lower end, spaced upwardly projecting flanges on the upper end of the cutter overlapping the inner and outer sides of the flange of the shank, bolts extending through the flanges of the head and cutter, and a lug on the cutter extending between its flanges and cooperating with an opening in the flange on the shank whereby the cutter is rotated by the shank.

In witness that we claim the foregoing we have hereunto subscribed our names this 1st day of November, 1927.

JESSE C. WRIGHT. LYNN F. BONNEY. 

